CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / Schematic
The electrical reference
Electrical drawings.
Every detail, explained.
Symbols, protection codes and equipment references for switchgear, switchboards, switchrooms and microgrids.
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1095 entries · Original illustrations
Power distribution
Isolator
Disconnector
A switching device providing an electrical isolation function.
SLD / Schematic
LBS
Load-break switch
A switch with a specified capability to make and break normal load current.
SLD / Schematic
ES
Earthing switch
A switch used to connect an identified circuit section to earth.
SLD / Schematic
FU
Fuse
An overcurrent protective element that interrupts a circuit by melting its fuse link.
SLD / Schematic
Bus
Busbar
A common conductive connection distributing power to connected circuits.
SLD / Schematic
TX
Power transformer
Equipment transferring electrical power between winding circuits.
SLD / Schematic
M
Three-phase motor
An electrical motor load connected to its switching and protective equipment.
SLD / Schematic
C
Capacitor
A capacitive component or bank identified with its circuit function and ratings.
SLD / Schematic
52
AC circuit breaker
The device-function number identifying an AC circuit breaker.
Protection functions
89
Line switch
The device-function number used for a line-switching or disconnecting device in its documented application.
Protection functions
Panel
Switchgear panel
A generic arrangement object linking switching equipment to its manufacturer drawings.
GA objects
Showing 12 of 182
Read the drawing, not just the mark
Small details. Different meanings.
Understand symbols, equipment tags and function numbers—and know when a generic object needs a manufacturer drawing.